butyl rubber
nitrile rubber
neoprene
thiokol
✅ The correct answer is option B.
Chemical Engineering MCQs
Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its
tensile strength
chemical resistance
flexibility
all (a), (b) & (c)
✅ The correct answer is option C.
Mastication of rubber means
its softening.
a treatment to retard its deterioration due to oxidation.
improving its curing rate.
depression of its freezing point.
✅ The correct answer is option A.
Vulcanisation of rubber
decreases its tensile strength.
increases its ozone & oxygen reactivity.
increases its oil & solvent resistance.
converts its plasticity into elasticity.
✅ The correct answer is option D.
Softening point of high density polythene is about __________ °C.
85
135
165
205
✅ The correct answer is option B.
Styrene which is a monomer for the production of polystyrene, is commercially produced by the
catalytic dehydrogenation of ethyl benzene.
dehydration of ethyl alcohol followed by hydrogenation.
reacting ethylene oxide with acetal-dehyde.
fermentation of starch.
✅ The correct answer is option A.
Which of the following is not present in bagasse fibre ?
Cellulose
Lignin
Pentogens
None of these
✅ The correct answer is option D.
Caprolactum, a raw material for the manufacture of nylon-6, is produced from
phenol
naphthalene
benzene
pyridine
✅ The correct answer is option C.
Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser ?
Ethylene glycol
Stearic acid estors
Tricresyl phosphate
Esters of phthalic acid
✅ The correct answer is option A.
Dacron (or terylene) fibres as compared to nylon fibres have
better heat & acid resistant properties.
poorer resistance to alkalis.
poorer dyeability.
all (a), (b) and (c).
✅ The correct answer is option D.